It is based on the US Core Simple Observation Profile profile and further constrains it:

• sets Observation.category[us-core] to "social-history

  social history"

• sets Observation.category[exposure] to "TRNS

  exposure"

• binds to suggested value sets for use in Observation.code
• further constrains Observation.subject to the US Public Health Patient

Profile Use Guidance:

• Observation.extension[address]: if known, an address where the exposure/contact took place
• Observation.code: The type of exposure/contact (environmental, activity, event, location, person, animal, etc.).
• Observation.focus: A reference to a Patient, RelatedPerson, Location, Group, etc. when the exposure/contact is an entity (person, animal, location)
  • an animal would be represented by a RelatedPerson that contains the Extension Practitioner Animal Species.
• Observation.valueString: free text information about the exposure/contact
• Observation.effective[x]: the date or period of exposure
• Observation.component: the possible agent of concern in the exposure

The following are some exposures that might be captured in this profile:

• Environmental exposures
  • Living facilities
  • Work facilities
  • School facilities
• Contact exposures
  • Person
  • Animal
• Event Exposures
  • Sporting event
  • Rally
  • Wedding
  • Activity

Represented USCDI+ Data Elements

• Key Elements Table
• Differential Table
• Snapshot Table
• Statistics/References
• All

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information Constraints: obs-6, obs-7
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required): Codes providing the status of an observation.
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by pattern:$this Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:us-core	S	0..*	CodeableConcept	(USCDI) Classification of type of observation Binding: US Core Simple Observation Category (required): Note that other codes are permitted, see Required Bindings When Slicing by Value Sets Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Type Binding: LOINCCodes (preferred)
Slices for coding	Σ	0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	SΣ	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
subject	SΣ	1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	SΣ	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
effective[x]	SΣ	0..1		(USCDI+) Exposure/Contact Date
effectiveDateTime			dateTime S
effectivePeriod			Period
effectiveTiming			Timing
effectiveInstant			instant
performer	SΣ	0..*	Reference(US Core Practitioner Profile | US Core Organization Profile | US Core Patient Profile | PractitionerRole | US Core CareTeam Profile | US Core RelatedPerson Profile)	(USCDI) Who is responsible for the observation
value[x]	SΣC	0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept S
valueString			string S
component	SΣ	0..*	BackboneElement	Possible agent of concern in the exposure
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Binding: LOINCCodes (example): Codes identifying names of simple observations. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣ	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code	URI
Observation.status	required	ObservationStatus http://hl7.org/fhir/ValueSet/observation-status|4.0.1 From the FHIR Standard
Observation.category	preferred	ObservationCategoryCodes http://hl7.org/fhir/ValueSet/observation-category From the FHIR Standard
Observation.category:us-core	required	Pattern Value: social-history http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code	preferred	LOINCCodes(a valid code from LOINC) http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov
Observation.component.code	example	Pattern Value: EXPAGNT http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()

This structure is derived from USCoreSimpleObservationProfile

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation		0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
Slices for category				Content/Rules for all slices
category:us-core		0..*	CodeableConcept	(USCDI) Classification of type of observation Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code		1..1	CodeableConcept	(USCDI+) Exposure/Contact Type
Slices for coding		0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	S	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	S	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	S	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
subject		1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	S	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
effective[x]		0..1	dateTime, Period, Timing, instant	(USCDI+) Exposure/Contact Date
value[x]		0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept
valueString			string
component	S	0..*	BackboneElement	Possible agent of concern in the exposure
code	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
value[x]	S	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
Documentation for this format

Terminology Bindings (Differential)

Path	Conformance	ValueSet	URI
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information Constraints: obs-6, obs-7
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..*	Identifier	Business Identifier for observation
basedOn	Σ	0..*	Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ServiceRequest)	Fulfills plan, proposal or order
partOf	Σ	0..*	Reference(MedicationAdministration | MedicationDispense | MedicationStatement | Procedure | Immunization | ImagingStudy)	Part of referenced event
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required): Codes providing the status of an observation.
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by pattern:$this Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:us-core	S	0..*	CodeableConcept	(USCDI) Classification of type of observation Binding: US Core Simple Observation Category (required): Note that other codes are permitted, see Required Bindings When Slicing by Value Sets Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Type Binding: LOINCCodes (preferred)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
Slices for coding	Σ	0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	SΣ	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
text	Σ	0..1	string	Plain text representation of the concept
subject	SΣ	1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	SΣ	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
encounter	Σ	0..1	Reference(Encounter)	Healthcare event during which this observation is made
effective[x]	SΣ	0..1		(USCDI+) Exposure/Contact Date
effectiveDateTime			dateTime S
effectivePeriod			Period
effectiveTiming			Timing
effectiveInstant			instant
issued	Σ	0..1	instant	Date/Time this version was made available
performer	SΣ	0..*	Reference(US Core Practitioner Profile | US Core Organization Profile | US Core Patient Profile | PractitionerRole | US Core CareTeam Profile | US Core RelatedPerson Profile)	(USCDI) Who is responsible for the observation
value[x]	SΣC	0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept S
valueString			string S
dataAbsentReason	C	0..1	CodeableConcept	Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
note		0..*	Annotation	Comments about the observation
bodySite		0..1	CodeableConcept	Observed body part Binding: SNOMEDCTBodyStructures (example): Codes describing anatomical locations. May include laterality.
method		0..1	CodeableConcept	How it was done Binding: ObservationMethods (example): Methods for simple observations.
specimen		0..1	Reference(Specimen)	Specimen used for this observation
device		0..1	Reference(Device | DeviceMetric)	(Measurement) Device
referenceRange	C	0..*	BackboneElement	Provides guide for interpretation Constraints: obs-3
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
low	C	0..1	SimpleQuantity	Low Range, if relevant
high	C	0..1	SimpleQuantity	High Range, if relevant
type		0..1	CodeableConcept	Reference range qualifier Binding: ObservationReferenceRangeMeaningCodes (preferred): Code for the meaning of a reference range.
appliesTo		0..*	CodeableConcept	Reference range population Binding: ObservationReferenceRangeAppliesToCodes (example): Codes identifying the population the reference range applies to.
age		0..1	Range	Applicable age range, if relevant
text		0..1	string	Text based reference range in an observation
hasMember	Σ	0..*	Reference(Observation | QuestionnaireResponse | MolecularSequence)	Related resource that belongs to the Observation group
derivedFrom	Σ	0..*	Reference(Observation | US Core DocumentReference Profile | US Core QuestionnaireResponse Profile | ImagingStudy | Media | MolecularSequence)	(USCDI) US Core Profiles or other resource the observation is made from
component	SΣ	0..*	BackboneElement	Possible agent of concern in the exposure
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Binding: LOINCCodes (example): Codes identifying names of simple observations. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣ	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
dataAbsentReason	C	0..1	CodeableConcept	Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code	URI
Observation.language	preferred	CommonLanguages http://hl7.org/fhir/ValueSet/languages From the FHIR Standard Additional Bindings Purpose AllLanguages Max Binding
Observation.status	required	ObservationStatus http://hl7.org/fhir/ValueSet/observation-status|4.0.1 From the FHIR Standard
Observation.category	preferred	ObservationCategoryCodes http://hl7.org/fhir/ValueSet/observation-category From the FHIR Standard
Observation.category:us-core	required	Pattern Value: social-history http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code	preferred	LOINCCodes(a valid code from LOINC) http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov
Observation.dataAbsentReason	extensible	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason From the FHIR Standard
Observation.interpretation	extensible	ObservationInterpretationCodes http://hl7.org/fhir/ValueSet/observation-interpretation From the FHIR Standard
Observation.bodySite	example	SNOMEDCTBodyStructures http://hl7.org/fhir/ValueSet/body-site From the FHIR Standard
Observation.method	example	ObservationMethods http://hl7.org/fhir/ValueSet/observation-methods From the FHIR Standard
Observation.referenceRange.type	preferred	ObservationReferenceRangeMeaningCodes http://hl7.org/fhir/ValueSet/referencerange-meaning From the FHIR Standard
Observation.referenceRange.appliesTo	example	ObservationReferenceRangeAppliesToCodes http://hl7.org/fhir/ValueSet/referencerange-appliesto From the FHIR Standard
Observation.component.code	example	Pattern Value: EXPAGNT http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.component.dataAbsentReason	extensible	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason From the FHIR Standard
Observation.component.interpretation	extensible	ObservationInterpretationCodes http://hl7.org/fhir/ValueSet/observation-interpretation From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-3	error	Observation.referenceRange	Must have at least a low or a high or text : low.exists() or high.exists() or text.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()

Key Elements View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information Constraints: obs-6, obs-7
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required): Codes providing the status of an observation.
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by pattern:$this Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:us-core	S	0..*	CodeableConcept	(USCDI) Classification of type of observation Binding: US Core Simple Observation Category (required): Note that other codes are permitted, see Required Bindings When Slicing by Value Sets Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Type Binding: LOINCCodes (preferred)
Slices for coding	Σ	0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	SΣ	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
subject	SΣ	1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	SΣ	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
effective[x]	SΣ	0..1		(USCDI+) Exposure/Contact Date
effectiveDateTime			dateTime S
effectivePeriod			Period
effectiveTiming			Timing
effectiveInstant			instant
performer	SΣ	0..*	Reference(US Core Practitioner Profile | US Core Organization Profile | US Core Patient Profile | PractitionerRole | US Core CareTeam Profile | US Core RelatedPerson Profile)	(USCDI) Who is responsible for the observation
value[x]	SΣC	0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept S
valueString			string S
component	SΣ	0..*	BackboneElement	Possible agent of concern in the exposure
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Binding: LOINCCodes (example): Codes identifying names of simple observations. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣ	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code	URI
Observation.status	required	ObservationStatus http://hl7.org/fhir/ValueSet/observation-status|4.0.1 From the FHIR Standard
Observation.category	preferred	ObservationCategoryCodes http://hl7.org/fhir/ValueSet/observation-category From the FHIR Standard
Observation.category:us-core	required	Pattern Value: social-history http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code	preferred	LOINCCodes(a valid code from LOINC) http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov
Observation.component.code	example	Pattern Value: EXPAGNT http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()

Differential View

This structure is derived from USCoreSimpleObservationProfile

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation		0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
Slices for category				Content/Rules for all slices
category:us-core		0..*	CodeableConcept	(USCDI) Classification of type of observation Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code		1..1	CodeableConcept	(USCDI+) Exposure/Contact Type
Slices for coding		0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	S	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	S	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	S	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
subject		1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	S	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
effective[x]		0..1	dateTime, Period, Timing, instant	(USCDI+) Exposure/Contact Date
value[x]		0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept
valueString			string
component	S	0..*	BackboneElement	Possible agent of concern in the exposure
code	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Required Pattern: At least the following
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
value[x]	S	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
Documentation for this format

Terminology Bindings (Differential)

Path	Conformance	ValueSet	URI
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov

Snapshot View

Name	Flags	Card.	Type	Description & Constraints    Filter: Bindings Constraints Obligations
Observation	C	0..*	USCoreSimpleObservationProfile	US Public Health Exposure Contact Information Constraints: obs-6, obs-7
id	Σ	0..1	id	Logical id of this artifact
meta	Σ	0..1	Meta	Metadata about the resource
implicitRules	?!Σ	0..1	uri	A set of rules under which this content was created
language		0..1	code	Language of the resource content Binding: CommonLanguages (preferred): A human language. Additional Bindings Purpose AllLanguages Max Binding
text		0..1	Narrative	Text summary of the resource, for human interpretation This profile does not constrain the narrative in regard to content, language, or traceability to data elements
contained		0..*	Resource	Contained, inline Resources
Slices for extension		0..*	Extension	Exposure/contact address Slice: Unordered, Open by value:url
extension:address	S	0..1	Address	US Public Health Address Extension URL: http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension
modifierExtension	?!	0..*	Extension	Extensions that cannot be ignored
identifier	Σ	0..*	Identifier	Business Identifier for observation
basedOn	Σ	0..*	Reference(CarePlan | DeviceRequest | ImmunizationRecommendation | MedicationRequest | NutritionOrder | ServiceRequest)	Fulfills plan, proposal or order
partOf	Σ	0..*	Reference(MedicationAdministration | MedicationDispense | MedicationStatement | Procedure | Immunization | ImagingStudy)	Part of referenced event
status	?!SΣ	1..1	code	(USCDI) registered | preliminary | final | amended + Binding: ObservationStatus (required): Codes providing the status of an observation.
Slices for category	S	1..*	CodeableConcept	(USCDI) Classification of type of observation Slice: Unordered, Open by pattern:$this Binding: ObservationCategoryCodes (preferred): Codes for high level observation categories.
category:us-core	S	0..*	CodeableConcept	(USCDI) Classification of type of observation Binding: US Core Simple Observation Category (required): Note that other codes are permitted, see Required Bindings When Slicing by Value Sets Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/observation-category
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: social-history
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
category:exposure	S	1..1	CodeableConcept	(USCDI+) Exposure/Contact Direction Binding: ActClassExposure (3.0.0) (required)
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Type Binding: LOINCCodes (preferred)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations Slice: Unordered, Open by value:url
Slices for coding	Σ	0..*	Coding	Each slice contains a suggested value set, but values are not restricted to these value sets. Slice: Unordered, Open by value:$this
coding:exposureSetting	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Setting (COVID-19) (required)
coding:exposureLocation	SΣ	0..1	Coding	Code defined by a terminology system Binding: Exposure Location (required)
coding:exposureSocial	SΣ	0..1	Coding	Code defined by a terminology system Binding: SocialHistoryTypeSCT (20250422) (required)
text	Σ	0..1	string	Plain text representation of the concept
subject	SΣ	1..1	Reference(US Public Health Patient)	(USCDI) Who and/or what the observation is about
focus	SΣ	0..*	Reference(US Public Health Patient | RelatedPerson | Group | US Public Health Location)	(USCDI+) Exposure/Contact Source/Target Participant
encounter	Σ	0..1	Reference(Encounter)	Healthcare event during which this observation is made
effective[x]	SΣ	0..1		(USCDI+) Exposure/Contact Date
effectiveDateTime			dateTime S
effectivePeriod			Period
effectiveTiming			Timing
effectiveInstant			instant
issued	Σ	0..1	instant	Date/Time this version was made available
performer	SΣ	0..*	Reference(US Core Practitioner Profile | US Core Organization Profile | US Core Patient Profile | PractitionerRole | US Core CareTeam Profile | US Core RelatedPerson Profile)	(USCDI) Who is responsible for the observation
value[x]	SΣC	0..1		Specific exposure/contact
valueCodeableConcept			CodeableConcept S
valueString			string S
dataAbsentReason	C	0..1	CodeableConcept	Why the result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
note		0..*	Annotation	Comments about the observation
bodySite		0..1	CodeableConcept	Observed body part Binding: SNOMEDCTBodyStructures (example): Codes describing anatomical locations. May include laterality.
method		0..1	CodeableConcept	How it was done Binding: ObservationMethods (example): Methods for simple observations.
specimen		0..1	Reference(Specimen)	Specimen used for this observation
device		0..1	Reference(Device | DeviceMetric)	(Measurement) Device
referenceRange	C	0..*	BackboneElement	Provides guide for interpretation Constraints: obs-3
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
low	C	0..1	SimpleQuantity	Low Range, if relevant
high	C	0..1	SimpleQuantity	High Range, if relevant
type		0..1	CodeableConcept	Reference range qualifier Binding: ObservationReferenceRangeMeaningCodes (preferred): Code for the meaning of a reference range.
appliesTo		0..*	CodeableConcept	Reference range population Binding: ObservationReferenceRangeAppliesToCodes (example): Codes identifying the population the reference range applies to.
age		0..1	Range	Applicable age range, if relevant
text		0..1	string	Text based reference range in an observation
hasMember	Σ	0..*	Reference(Observation | QuestionnaireResponse | MolecularSequence)	Related resource that belongs to the Observation group
derivedFrom	Σ	0..*	Reference(Observation | US Core DocumentReference Profile | US Core QuestionnaireResponse Profile | ImagingStudy | Media | MolecularSequence)	(USCDI) US Core Profiles or other resource the observation is made from
component	SΣ	0..*	BackboneElement	Possible agent of concern in the exposure
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
modifierExtension	?!Σ	0..*	Extension	Extensions that cannot be ignored even if unrecognized
code	SΣ	1..1	CodeableConcept	(USCDI+) Exposure/Contact Agent Binding: LOINCCodes (example): Codes identifying names of simple observations. Required Pattern: At least the following
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
coding		1..*	Coding	Code defined by a terminology system Fixed Value: (complex)
id		0..1	string	Unique id for inter-element referencing
extension		0..*	Extension	Additional content defined by implementations
system		1..1	uri	Identity of the terminology system Fixed Value: http://terminology.hl7.org/CodeSystem/v3-ParticipationType
version		0..1	string	Version of the system - if relevant
code		1..1	code	Symbol in syntax defined by the system Fixed Value: EXPAGNT
display		0..1	string	Representation defined by the system
userSelected		0..1	boolean	If this coding was chosen directly by the user
text		0..1	string	Plain text representation of the concept
value[x]	SΣ	1..1		Actual component result
valueCodeableConcept			CodeableConcept
valueString			string
dataAbsentReason	C	0..1	CodeableConcept	Why the component result is missing Binding: DataAbsentReason (extensible): Codes specifying why the result (Observation.value[x]) is missing.
interpretation		0..*	CodeableConcept	High, low, normal, etc. Binding: ObservationInterpretationCodes (extensible): Codes identifying interpretations of observations.
referenceRange		0..*	See referenceRange (Observation)	Provides guide for interpretation of component result
Documentation for this format

Terminology Bindings

Path	Conformance	ValueSet / Code	URI
Observation.language	preferred	CommonLanguages http://hl7.org/fhir/ValueSet/languages From the FHIR Standard Additional Bindings Purpose AllLanguages Max Binding
Observation.status	required	ObservationStatus http://hl7.org/fhir/ValueSet/observation-status|4.0.1 From the FHIR Standard
Observation.category	preferred	ObservationCategoryCodes http://hl7.org/fhir/ValueSet/observation-category From the FHIR Standard
Observation.category:us-core	required	Pattern Value: social-history http://hl7.org/fhir/us/core/ValueSet/us-core-simple-observation-category
Observation.category:exposure	required	ActClassExposure http://terminology.hl7.org/ValueSet/v3-ActClassExposure|3.0.0
Observation.code	preferred	LOINCCodes(a valid code from LOINC) http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.code.coding:exposureSetting	required	PHVS_ExposureSetting_COVID-19 http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.7942
Observation.code.coding:exposureLocation	required	PHVS_ExposureLocation_CDC http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3209
Observation.code.coding:exposureSocial	required	SocialHistoryTypeSCT http://cts.nlm.nih.gov/fhir/ValueSet/2.16.840.1.113883.3.88.12.80.60|20250422 From https://vsac.nlm.nih.gov
Observation.dataAbsentReason	extensible	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason From the FHIR Standard
Observation.interpretation	extensible	ObservationInterpretationCodes http://hl7.org/fhir/ValueSet/observation-interpretation From the FHIR Standard
Observation.bodySite	example	SNOMEDCTBodyStructures http://hl7.org/fhir/ValueSet/body-site From the FHIR Standard
Observation.method	example	ObservationMethods http://hl7.org/fhir/ValueSet/observation-methods From the FHIR Standard
Observation.referenceRange.type	preferred	ObservationReferenceRangeMeaningCodes http://hl7.org/fhir/ValueSet/referencerange-meaning From the FHIR Standard
Observation.referenceRange.appliesTo	example	ObservationReferenceRangeAppliesToCodes http://hl7.org/fhir/ValueSet/referencerange-appliesto From the FHIR Standard
Observation.component.code	example	Pattern Value: EXPAGNT http://hl7.org/fhir/ValueSet/observation-codes From the FHIR Standard
Observation.component.dataAbsentReason	extensible	DataAbsentReason http://hl7.org/fhir/ValueSet/data-absent-reason From the FHIR Standard
Observation.component.interpretation	extensible	ObservationInterpretationCodes http://hl7.org/fhir/ValueSet/observation-interpretation From the FHIR Standard

Constraints

Id	Grade	Path(s)	Details	Requirements
dom-2	error	Observation	If the resource is contained in another resource, it SHALL NOT contain nested Resources : contained.contained.empty()
dom-3	error	Observation	If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource : contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()
dom-4	error	Observation	If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated : contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()
dom-5	error	Observation	If a resource is contained in another resource, it SHALL NOT have a security label : contained.meta.security.empty()
dom-6	best practice	Observation	A resource should have narrative for robust management : text.`div`.exists()
ele-1	error	**ALL** elements	All FHIR elements must have a @value or children : hasValue() or (children().count() > id.count())
ext-1	error	**ALL** extensions	Must have either extensions or value[x], not both : extension.exists() != value.exists()
obs-3	error	Observation.referenceRange	Must have at least a low or a high or text : low.exists() or high.exists() or text.exists()
obs-6	error	Observation	dataAbsentReason SHALL only be present if Observation.value[x] is not present : dataAbsentReason.empty() or value.empty()
obs-7	error	Observation	If Observation.code is the same as an Observation.component.code then the value element associated with the code SHALL NOT be present : value.empty() or component.code.where(coding.intersect(%resource.code.coding).exists()).empty()

This structure is derived from USCoreSimpleObservationProfile

Summary

Mandatory: 1 element(1 nested mandatory element)
Must-Support: 9 elements

Structures

This structure refers to these other structures:

• US Public Health Patient (http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-patient)
• US Public Health Location (http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-location)

Extensions

This structure refers to these extensions:

• http://hl7.org/fhir/us/ph-library/StructureDefinition/us-ph-address-extension

Slices

This structure defines the following Slices:

• The element 1 is sliced based on the value of Observation.code.coding

Maturity: 3